Change of colours of other materials in ACIDS AND BASES – Class 7 Science Experiment

Chapter Name: ACIDS AND BASES

Activity Name: Change of colours of other materials in ACIDS AND BASES

Activity Description:

Change of colours of other materials in ACIDS AND BASES - Class 7 Science Experiment

In this experiment, we will test various substances using natural indicators to observe changes in color. Turmeric paper, a natural indicator, will be used as the initial indicator.

We will add different substances from Table-3 onto the turmeric paper and observe whether their addition causes a change in color. Substances that show a color change in the presence of other substances are called indicators.

Required Items:

  1. Turmeric paper
  2. Substances from Table-3
  3. Natural indicators (to be prepared, details not provided in this excerpt)

Step by Step Procedure:

  1. Take a piece of turmeric paper.
  2. Prepare the natural indicators mentioned in Table-2 (specifics not given here).
  3. Place each substance from Table-3 on the turmeric paper, one by one.
  4. Observe the turmeric paper after adding each substance and note whether there is a change in color.

Experiment Observations:

  1. Observe the color change on the turmeric paper after adding each substance from Table-3.
  2. Note down the changed colors in Table-2 for each substance.

Precautions:

  1. Handle all substances with care, especially if they are hazardous or toxic.
  2. Follow safety guidelines while performing the experiment.
  3. Use appropriate protective equipment if required.
  4. Dispose of chemicals and waste properly after the experiment.

Lesson Learnt from Experiment:

  1. The experiment helps to understand the concept of indicators and how they can be used to detect the presence of certain substances.
  2. Different substances cause changes in the color of turmeric paper, indicating their acidic or basic nature.
  3. Natural indicators can be an alternative to synthetic indicators for some applications.

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